Null Magic Rune

From Ars Magica

A null magic rune is created by right clicking on the ground while holding Purple Chalk which is created by combining bonemeal, purple dye, flint, paper, and Arcane Ash. It is currently slightly bugged and will not always work, however it is intended by Mithion to periodically dispel any entity as well as cause any spells sent into their radius to stop, hence the name "Null Magic Rune". The player and other entities also may not cast any spells while in the radius of the rune. However the player and other entities may use blink or seven league stride to enter the radius of the rune. This is intended to happen by Mithion, as that purpose is fulfilled by the Astral Barrier